Kohler — Controller Circuit Board Replacement Procedure
Repair & overhaul
From a Kohler service manual — check it applies to your exact model before use.
Applies to: Kohler RDT
Before you start
- Electrostatic discharge damage. Wear an approved grounding wrist strap.
- Hazardous voltage. Disconnect all power sources before opening the enclosure.
Procedure
- Press OFF on the generator set controller.
- Disconnect the generator set engine starting battery, negative lead first.
- Disconnect power to the transfer switch; wait at least 25 minutes for the power supply to discharge.
- Open the enclosure and check voltage at source connections to verify power is off.
- Disconnect the accessory board connections (P9, RJ45) if equipped and remove the accessory board.
- Disconnect all connections to the controller circuit board (P1, P2, P4, P7).
- Pull the circuit board off the five standoffs and place the new board onto the bracket.
- Reconnect all connectors, reinstall the accessory board, replace the enclosure door, reconnect power, and press AUTO.
Tools required
- grounding wrist strap Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Wait at least 25 minutes for power supply discharge
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.